ERROR_IPSEC_IKE_INVALID_SIGNATURE - 13826 (0x3602)
Failed to verify signature.
Updated: Feb 21, 2026
Technical Meaning
The ERROR_IPSEC_IKE_INVALID_SIGNATURE error code indicates that a signature verification process failed during the Internet Key Exchange (IKE) phase of IPsec negotiations. This typically occurs when the system attempts to validate a digital signature but finds it invalid or unable to be verified.
Error Details
This error is specific to the IPsec protocol and its IKE component, which are used for establishing secure communication channels over networks. The failure to verify a signature can have several implications, such as potential security breaches or incorrect configuration of cryptographic parameters.
Usage Context
The ERROR_IPSEC_IKE_INVALID_SIGNATURE error may be encountered in various scenarios where IPsec is being configured or utilized. Common contexts include setting up secure connections between network devices, establishing virtual private networks (VPNs), and configuring endpoint-to-endpoint communication with security requirements.
Developer Interpretation
As a developer, encountering this error suggests that there might be an issue with the cryptographic material used in the IPsec negotiation process. This could involve incorrect keying material, misconfigured security policies, or corrupted data being exchanged during the handshake phase. Developers should ensure that all cryptographic parameters are correctly set and that the involved entities have valid and unexpired certificates.
Related Errors
ERROR_IPSEC_IKE_CERT_EXPIRED(13825): Indicates an expired certificate was encountered.ERROR_IPSEC_IKE_CERT_REVOKED(13827): Suggests a revoked certificate was used in the negotiation process.
FAQ
Q: What does the ERROR_IPSEC_IKE_INVALID_SIGNATURE error mean?
A: It indicates that a digital signature could not be verified during an IPsec IKE negotiation, which may indicate issues with cryptographic material or configuration.
Q: How can I troubleshoot this issue?
A: Review the security policies and ensure all keys and certificates are valid and correctly configured. Verify the integrity of the data being exchanged and check for any expired or revoked credentials.
Summary
The ERROR_IPSEC_IKE_INVALID_SIGNATURE error is a generic indication that a signature verification process failed during IPsec IKE negotiations. Developers should focus on ensuring cryptographic material is correct and up-to-date to resolve this issue.